61 research outputs found
Studies of Histidine, Phenylalanine Complexes of Oxovanadium(IV) Derived from Acetylacetone
No full textSchiff base complexes of oxovanadium(IV) with amino acids and acetylacetone were synthesized and characterized by elemental analysis, conductivity measurements, spectral and magnetic data. The complexes were found to be non-electrolytes and stoichiometry shown 1:1. The spectral and magnetic data were suggesting the square pyramidal geometr
Synthesis by co-precipitation method, structural and optical properties of ZnO and nickel doped ZnO nanoparticles
No full textThe structural and optical properties of Ni doped ZnO nanoparticles (NPs) prepared by co-precipitation method have been investigated. The X-ray diffraction pattern confirmed synthesized nanoparticles retained the wurtzite hexagonal structure. From FESEM studies, ZnO and Ni doped ZnO NPs showed Spherical & nanorod mixed phase morphology for undoped and Ni doped ZnO NPs respectively. The amount of dopant (Ni2+) incorporated into ZnO sample was determined by EDAX. The FT-IR spectra confirmed the Zn-O stretching bands at 444 and 451cm-1 for ZnO and Ni doped ZnO NPs. Optical absorption measurements show an absorption peak at 376 and 374 nm which was due to excitonic absorption of the pure ZnO and Ni doped ZnO NPs respectively The photoluminescence measurements revealed that the broad emission was composed of seven different bands due to zinc vacancies, oxygen vacancies and surface defects
Impact of transition metal ion Co2+ on structural and optical properties of ZnO nanoparticles synthesised by co-precipitation method
No full textPure Zinc oxide (ZnO NPs), Zn0.70Co0.30O and Zn0.50Co0.50O nanoparticles (NPs) were synthesized by the co-precipitation method. The synthesized nanoparticles retained the wurtzite hexagonal structure, which was confirmed by the X-ray diffraction studies. The oxidation states of the elements O (1s), Zn (2p), and Co (2p) were confirmed by XPS studies. HRTEM images showed that the particles sizes were approximately 20-40 nm and spherical shape for pure and hexagonal shape both Zn0.70Co0.30O and Zn0.50Co0.50O NPs respectively. The FT-IR spectra confirmed the Zn-O stretching bands range at 421 to 495 cm-1 for ZnO NPs. From the UV–VIS spectroscopic measurements, the excitonic pecks were found around 393, 399 and 396 nm for the respective samples. The photoluminescence measurements revealed that the broad emission composed of five different bands due to zinc and oxygen vacancies
Synthesis, structural and optical properties of pure ZnO and Co doped ZnO nanoparticles prepared by the co-precipitation method
No full textImpact of Japan International Co-Operation Agency (JICA) Extension Project on Quality Silk Production: a Case Study
No full textSericulture, as an agro-based enterprise, occupies an important position in Indian economy due to its high employment potential, low capital intensive and remunerative nature of the production that churns out value added products of economic importance. India is the second largest producer of raw silk, next only to China accounting for more than 13 per cent of the global silk production. The total annual production of raw silk in India was 18.48 thousand MT, of which mulberry raw silk output aggregated to about 16.53 thousand MT during 2006-07. However, the major concern of the Indian silk industry is the low level of quality and productivity as compared to other major silk producing countries such as China and Brazil. The major reason for the above problem is that the silk is produced by the use of crossbreed cocoons for reeling raw silk. The silk reeled out of these crossbreed cocoons produced in India reaches a maximum grade of C by the international standards. This silk is not preferred in the high-speed looms and mill sectors due to less uniformity, short filament length, more winding breaks and high degumming losses as compared to imported silk (Naik and Babu, 199
Development and validation of stability indicating UPLC method for the simultaneous estimation of triamterene and hydrochlorothiazide in combined dosage forms using quality by design approach
No full textAbstract Background According to the information gathered from the literature, no technique for UPLC of triamterene and hydrochlorothiazide employing QbD in the formulations has been published. The technique development by incorporating QbD and validating for accuracy, linearity, precision, LOQ, LOD, ruggedness and selectivity as per ICH is part of the work’s modernity. Results Screening investigations led to the selection of cmps. Peak tailing was evaluated as a metric of technique robustness based on these important analytical attributes, namely retention time. With a 0.1 percent OPN: methanol (40:60) mobile phase, a flow rate of 0.3 ml/min, a wave length of 224 nm, an injection volume of 41, and a run time of 6 min, the best chromatographic separation was attained. Conclusions The method was verified using ICH criteria, which ensure a high level of linearity, accuracy, precision, specificity and robustness. As a result, the suggested approach is regarded as a quick and accurate method for estimating triamterene and hydrochlorothiazide at the same time
Colonial Shadows and Female Light: Paule Marshall’s Vision of Resistance in Brown Girl, Brownstones and The Chosen Place, The Timeless People
No full textIn the present studies, Paule Marshall’s presentation of resistance displayed by Black women across colonial history and within recent times highlights the works Brown Girl, Brownstones and The Chosen Place, The Timeless People. The paper applies a postcolonial feminist viewpoint to explore how Marshall develops broad female protagonists who face obstacles from disappearance from culture, poverty and patriarchy. With inspiration from postcolonial theory, Black feminist thought and intersectionality, the analysis finds that Marshall highlights diasporic identity as something involving hardship and strength. Paule Marshall tells important stories in African American and Caribbean literature about Black womanhood, fighting for freedom and transformation in times of colonization and later years. This article investigates how Marshall’s female characters in Brown Girl, Brownstones (1959) and The Chosen Place, The Timeless People (1969) stand up to the legacies left by colonialism. Postcolonial and feminist theory help the author point out that Marshall observes resistance not merely as disruptive action, but as something rooted in spirituality, community life and the need to redefine oneself and one’s culture. Furthermore, the study talks about symbols and actual places of resistance, where personal development and collective memory combine to represent autonomy and picture a future free from colonialism. Marshall’s stories reveal the continuing role of women in carrying culture and driving progress in these still colonial influenced societies
Prediction of Hashtag Popularity Using Twitter Features in Machine Learning Approach Proceedings
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